Propeller for marine vessels.



No. 823,476. PATENTED JUNE 12, 1906. J. DELA MAR.

PROPELLER FOR MARINE VESSELS.

Inventor: MAA@ Y Mm /l/5 Atty APPLICATION FILED AUG 8 1905 PATENT OEEIOE.

. iUNiiEDA sTAflrs JOSEPH ,DELA MAE, or NEW `YoRK,.N. Y., AssieNoR OF ,ONE-HALE To JACOB J. NicHoLs, OE BROOKLYN, NEW YORK.

PRQPELLE'R 'FOR MARINE VESSELS.

To all whom it may concern:

1 3e it known that I, JosErH DELA MAR, a resident of the city of New York, borough of AManhattan, and State of New York, have invented a certain newl and `useful Improvef formed rib and another set of. propellerblades arranged within the spiral rib of the first-mentioned set, but entirely disconnected.

A feature of this improvement consists of means for supporting the two sets of propeller-blades so that they may be rotated at different speeds.

Another feature is a reverse inclination of one set of propeller-blades relatively to the other set and means for rotating the two sets of pro eller-blades in opposite directions.

Eac set of propeller-blades may be eX- tended helically for any desired length about its axis, as will now be set forth in detail.

In the drawings, Figure l is a top View of plan of a propeller embodying my 'improvement, a certain part being broken away to exhibitJ another'which is contained within it 5 and Fig. 2 is a transverse section of the same,

taken at the plane of the dotted line 2 2 in Fig. l.

A designates a` tubular shaft supported in a bearing B and also supported an internal shaft C. The projecting end of the shaft A has mounted upon it a collar E, and at the projecting end of the shaft C is also a loose collar D, the latter being free to turn independently of the shaft Gand to with the shaft A.

A spiral rib E is secured at one end to the collar D of shaft A and at the' other to the loose collar D', thus securing this shaft and the collar together, so they will rctlate unison. To this spiral rib part is zattached a number of obliqiiely-disposed blades F. As here shown each of these blades is provided with a lug with which is combined a screw' f2, passing through it and engaginwith a tapped ho e in the spiral rib, these b ades be-V ing. secured at regular intervals to the rib. This means of attachin the blades' to the rib makes it possible to a just them at various angles, because the screws when tightened Specification of Letters Patent.

l Application filed August 8, 1905. Serial No. 273,245.

Patented June 12, 1906.

will `clamp the blades in their desired positions upon the rib. 5

The shaft C is shown as supported in bear-t ings G G2. Between'v the co lars D D the shaft C has affixed' to it a number of propeller-blades H. These may be advantageously secured in the same way asthe blades F-namely, by means of lugs h and screws h2 passing through said lugs and engaging with tapped holes inthe shaft Cthis mode o'f'securing them being desirable, because it affords op ortunity for varying the' inclination of the b ades.

' To the shaft A is secured a gear-wheel I and to the shaft C a gear-wheel J for the purpose of enabling rotary motion to be trans'- mitted from any suitable source of power to the said shafts inde` endently of one another. As here shown, -bot the gear-wheels I J derive motion from a oWer-shaft K through The blades H are of such eX- tension diametrically of the shaft C that they Amay work within the spiral rib.

the agency of gear-w eels L M, ath :ed to the l latter.v The gear-wheel L is shown 'as engag-f ing directly with the gear-wheel `I; but the gear-wheel M is shown as engagin .with the gear-wheel J through an interme iate gearwheel C, supported u on a shaft I. When the shafts A C are tlius rotated, they will turn m opposite directions, and this would be proper when the two setsA of pro ellerblades F and H are arranged in reverse y-eX- tending-helices. The speeds at which the two sets cf blades will rotate ma not be the same. It is also optionawith the constructor to extend the two sets of blades helically to any length about the shafts A C. Inclination of blades in the two sets, the relative speeds of the two sets Ofblades, and the length of the helices comprising the two sets of blades are all variable at the will of the constructor to meet-his requirements from itime to time.

or may ,form-of a screw, with the result that it pro- 4 duces -bu't little resistance to the Water, and

the blades F, which are attached thereto exteriorly, therefore rotate through a mass of Water which is not disturbed or agitated by radially-projecting arms. As this type of yWheelis. designed to rotate at a high rate of s eed, it is o vious that the 'tendency of the b ades F is to throw the Water outwardly l preferably the inner bl tion is not from' the shaft, and thus form a core within the rib. of less density than without. To counteract this tendency,the inner blades H are secured to the shaft C- at reverse inclinations to the blades `F, so that theinner and outer blades rotate in lop osite directions, and

ages travel at a higher speed than the outer blades, theresult .being that the innen blades have a tendency to produce a vacuum, and the mass of water sur.

rounding the Wheel is thus impell'ed to move toward the core of the Wheel, making possible a moreeflective action of the blades thanv would otherwise be the case. l

. It is obvious that my structure permits of most efficient Workingv'when the Wheel isreversed, and furthermore the cost of construcv said sets of bladesbein'g adjustably Vfastened to its supports, substantially as described.v

3. The combination of a set of 5 ropellerblades on a spirally-formed rib, an another set of propel er-blades arranged within the annulus the. first-mentioned set, both of 4. The 'combinatio'nl of a set of f blades `on airally-formed rib, an another 1- set of prop l ,-arffbladesl reversely inclined to and arranged the 'annulus of the rstmentione set, substantially as described.

5 The combination of a set of propellerl prohibitive for this class of Wheels.

blades on a spirally-lfor'med rib, another set of propeller-blades .arranged 'Within the annulus of the first-mentioned set, and means for rotating the two sets of propeller-blades at dif'- ferent rates of speed, substantially as described;

propeller-blades reversely inclined to and arranged Within the annulus of the first-men- -ti'oned set, and means for rotating the two sets of blades in o posite directions, substantially as desc `7. A prop eller-wheel, comprising the Acombination of a' tubular shaft having on its projeillg through the tubular shaft and projecting beyond, rovide'd loose collar, a spiral rib secu-reg at its opposite ends-to the rigid collar on the tubular shaft, and to the loose collar on the internal shaft, a set of propeller-blades mounted on the spiral rib and a set of ropeller-blade's mounted on the internal s aft Within said spiral rib, as set forth.

8. A propeller-Wheel having .a spiral rib secured'to 'a tubular shaft and so arranged that the Wheel in moving through the Water will follow the motion of a screw, propeller-blades exteriorly on saidrib, and propellerblades said rib, secured to anindependent shaft, and disconnected from said rib.

series of adjustable propeller-blades Von Va ntly of said outer blades. 10. A propeller-wheel having a series ofadl vals along a spirally-formed rib, and a series of adjustable propellerblades on a Ashaft within said rib and rotating a direction opposite to the blades on the rib.

ingwitnesses.- l y .rosari-1.13am Witnesses: l

E. vS. MITCHELL,

6. The combination of a setbof propellerblades on a spirally-flormed rib, another set of c end -a rigid collar, an internalv shaft' 19. .A propeller-Wheel having a series of ad-f justable propeller-blades 'arranged nat regular intervals along a lspi'rally-fermed rib, and a.;

shaft within said rib and operatilgindependjustable propeller-blades. arranged at inter' In testimony whereof. I have signed this' specilicationin the presence 'of two subscrib 

